Milling-machine attachment



' Jan. 11-., 1927.

1,614,245 E. J. JANAC v MILLING MACHINE ATTACHMENT Filed May 13.l 1925 yI 'IW y Patented dan. 11, 1927.

UNITED STATES Lauras PATsNr orties.

EDWARD J. JANAC, OF CHICAGO, ILLINOIS.

My invention relates to metal working and inore especially to a diesinkers radius finisher or attachment yfor milling machines or cutters,or similar machines designed for cherrying operations, radius finishingor for finishing concaved recesses in die castings and the like,especially where the recesses are narrow.

Experience in work of the above class has shown that it is best to roughthe work out, allowing anywhere from Tk to for iinishing, using an endmill for rough-V ing and a cherrying mill or square tool bits foriinishing, but under certain conditions, it is desirable to use amilling cutter in preference to using the tool bits as will behereinafter more fully explained. lVith my device, the gear cangenerally be lowered in the work after the latter is roughed out with anend mill and the gear will not be in the way. On the other hand, therewill be plenty of room on all sides of the gear, thus rendering itpossible to employ milling cutters or tool bits ashereinheforementioned.

The present invention therefore comprehends an attachment for milling orsimilar machines which is designed for radius finishing or for finishingconcave recesses in die castings and the like, which will permit thiswork to be efficiently and expeditiously carried out and which isespecially capable of working in narrow recesses in which presentdevices of this character are incapable of operation. The deviceinvolves a novel, simple and practical structure which may beeconomically manufactured and which can be easily attached to a millingmachine, or other similar machine, and quickly removed therefrom, inaddition to permitting universal adjustment around the drive shaft ofthe machine as an axis to present the cutters to recesses extendingangularly in different directions, and by which tool bits or millingcutters may be interchangeably used and quickly applied or removed.

The invention also resides in certain novel details of construction andthe arrangements of parts to he hereinafter more fully specified. i l

In the drawings:

Fig. 1 is a central longitudinal sectional view partly broken away andin elevation of a milling machine attachment embodying Application filedMay 13, 1925.

Serial No. 29,863.

the invention and showing the manner of applying the saine to a millingmachine;

Fig. 2 is a front elevation of the device shown .in Figure 1 andillustrating the action thereof;

Fig. 3 is a fragmental sectional plan view of the device shown in Figurel;

Fig. 4 is a fragmental detail sectional view of a part including a studbearing of the device; and

Fig. 5 is a 'fragmental sectional elevation of the device showinganother form in which a milling cutter is employed in lieu of tool bits.

Referring to the drawings, and especially Figure 1` in which the deviceis shown in assembled form, 6 designates a plate adapted to be appliedto the frame of a milling machine and to encircle the drive shaft 7thereof which projects through an aperture 8 centrally in the plate. Theplate lis formed with a circular T-shaped groove or slot 9 in the bottomand a circular opening 10 at the top communicating with the slot topermit insertion of bolts 11 into the slot 9, which receives the headsof the bolts 11 and which support the device as shown in Figure 1 andpermits turningor rotatable adjustment of the device therein. As shownin the latter figure, the device comprises a narrow bearing sleeve orframe 12 extending across the axis of the shaft 7 and having a verticalaperture or bore 13 to receive a shaft 14, which is provided with a rib15 extending across the upper end, forming a detachable drivingconnection with the slot 16 at the lower end of the drive shaft 7 of themilling` machine, and which is preferably enlarged for this purpose toengage a shoulder of the plate 6 around the aperture 8 and provided witha bearing sleeve or bushing as shown. The frame 12 has an annular flange17 extending varound the upper end which seats within a correspond` ingbottom recess 18 of the carrying plate 6 or a reduc-ed downwardextension i9 thereof, and is secured by the bolts 11 hav ing their headsengaged and held against turning in the slot 9 as heretofore described,and Passing through apertures 2O in1 tlief flange 17.

The shaft 14 has a beveled gear 21 fixed on the lower end and meshin .ywith'a beveled gear 22 at one side of the" aine 12. This' frame iswidened out at* both sides; ofthe' fill shafts 7 and lll in a planeparallel to the plane of the gear 22, as shown in Fig. 2, and at thelower end has an opening 3S toaccommodate the gear 21 and a somewhatlarge laterally extending horizontal stud bearing Q3, upon which thegear 22 is free to rotate in mesh with the gear 21. The stud 23 eri--tends below the frame proper 12 which is cut out or off above the centeror axis of the stud 23 to permit projection and clearance of the gearand cutter novv to he described. This gear vvheel 22 has attachedthereto or formed as a part thereof, a head Qlhaving sockets atdiametrically opposite points or otherwise formed to take and hold thetool bits 26, which do the cutting. rl'hese tool bits may be of varioustypes well known in this art and as illustrated, the head 2l is providedWith threaded openings 2T extending at right angles to the sockets 25from the periphery of the head for receiving set screivs 23 for securingthe bits in adjusted positions.

The cutter head Q4 is also bored out the same as the gear Q2, to receivethe bearing stud or projection Q3, and the latter, beyond the cutterhead 2l, is formed at the upper part n'iih a half round extension ,"1bracket is secured to the frame 12 by bolts 31, Which are passed throughapertures 32 of the frame 12, and has an arm 33 depending at the outerside of the cutter head 24 and provided With a semi-circular seat 3engaging the extension 29 of the bea-ring stud 23. A pin35 is appliedthrough the bifurcated lower end of the arm 33 and the extension 29 forlocking the parts together. ln order to correctly position the bracket30 and facilitate the application of the screws or bolts 31 through theframe and into the threaded sockets of the bracket as disclosed moreparticularly in Figures 1 and 2 of the drawings, holes are also providedadjacent each aperture 32 for receiving taper pins 37 in the manner ofdowel pins. It may also be remarked that the lower portion of the frame12 is provided With a transverse slot 38 to accommodate the beveled gear21, and the lower end of the shaft 111 is reduced as at 39 and hasbearing in a socket- 10 of the lower portion of the frame from Which thestud bearing 23y extends.

ith this construction, the fra-me 12. may be turned to any desiredangular position. horizontally or vertically, depending upon the type ofmilling or other machine to which the attachment is applied, Withoutloosening the bolts or nuts thereof, which connect the plate 17 to thecarrier 6, so that the cutter is arranged atany desired position aroundthe axis of the drive shaft 7. The bracket 30 and arm 33 thereof,affords a substantial brace for the cutter and inasmuch as the frame 12and bracket 30 termin at an elevation above the axis of'the cutter, thelatter is capable of Working in narrow recesses in Wrich present def'ices of this character are incapable of operation. The beveled gear 22may, in some cases, be recessed into the face of the cutter head ifdesired, so that the tool will operate in even narrower recesses thanWould otherwise be possible, as shown.

ln the embodiment of the invention shown in Figure 5 of the drawings,the structure is the same, except that the cutter head an ranged to usethe ordinary milling cutters of various types, instead of the bits 26.AAs shown, the milling cutter 4l is provided with a plurality, preferablytwo keyn'nys co-actingl with keyn'ays 43 of semi-circular or concavedforni in the collar or hub Pl of the beveled gear These lVoodruf key-Ways are designed to receive the ll'loodruf keys l5 which secure themilling cutter' detachably in position and permit dilferent types andsizes of milling cutters to be conveniently used. In either case, theWork is preferably roughed out by using anend or vertical mill and thenfinished by the present cherrying or radius finishing attachment usingthe tool bits or milling cutter as shall be found preferable. In diesinking Work, it will be found that the gear can be lowered in the Workafter it is roughed out with an end mill and the gear at the side of thecutter head vfill not be in the Way, but will allo plenty of room on allsides of the gear for effective Work in an expeditious and economicalmanner.

Vhile I have shown and described my invention in a1 preferred form, I amaware that various changes and modifications may be made Withoutdeparting from the principles of my invention, the scope of Which is tobe determined by the appended claims.

l claim as n'xy invention:

l. lin an attachment for milling machines or the like having a driveshaft` a frame. carried by the machine, a driven saal't journalled inthe frame and having operative connection with the drive shaft. saidframe being formed With a recess seating the low-- er end of said drivenshaft, said frame hav ing a laterally extending stud bearing, a beveledgear lined to the shaft, a second beveled gear journalled on the studbearing in mesh with the first gear, a critter head fixed to the secondgear to rotate therewith on the stud bearing and having peripheralcritters projecting outwardly of the periphery of the second gear.

2. ln an attachment. for milling machines or the like having a driveshaft, a rotatably adjustable frame carried by the machine, a drivenshaft journalled iu the frame and having operative connection with thedrive shaft` the lovver end of the frame being fo ned to provide athrust bearing for the driven shaft, said frame having an integral studbearing extending horizontally therefrom., a beveled gear fixed to theshaft, a second beveled gear journalled on the stud a shoulder at theinside abutting the second gear having a hub extension, a cutting oolkeyed to the hub extension in contact with the second gear, and abracket arm on the frame and bracing the stud bearing outwardly of thecutting tool. Y

3. In an attachment for milling machines or the like having a driveshaft, a frame carried by the machine and having a slot therethrough. adriven shaft journalled inthe frame and having operative connection withthe drive shaft, said frame having a stud bearing, a beveled gear fixedto the shaft, and mounted in the slot, a second beveled gear ournalledon the stud bearing in mesh v. th the first gear, the studbearing havinga shoulder at the inside abutting the sccond gear to take up end thrustand limit the movement thereof toward the first gear, a cutter head incontact with and fixed to rotate with the second gear on the studbearing and having peripheral cutters projecting outwardly of the secondgear, and a bracket fix-ed to the frame spaced from the gears and havingan offset arm engaging the stud bearing outwardly of the cutter head.

Li. .lu an attachment for milling machines or the like having a driveshaft, a frame rarried by the machine, means to adjust the frame. aboutthe shaft, a driven shaft journailed in the frame and having opera-tiveconnet-tion with the drive shaft, the lower end of the frame formed toprovide a thrust bearing for the shaft, said frame having a studbearing, a beveled gear fixed to the shaft, a. second beveled gearjournalled on `the stud bearing in mesh With the first gear, the studbearing having a shoulder abutting' the second gear to take up endthrust and limit the movement thereof toward the first gear, a cutterhead fixed to rotate with the second gear on the stud bearing and havingperipheral cutters projecting outwardly of the second gear, and thesecond gear being set in the cutterhead, a bracket fixed to the framespaced from. the gears and having' an offset arm engaging the studbearing outwardly of the cutter head.

5. In combination With a drive shaft, a carrying plate on Which theshaft is journalled and having a circular T-shaped slot, a frame havinga flange mounted in a recess of the plate, bo-lts connecting the flangeto the plate in the slot to permit angular adjustment of the frame onthe plate, a shaft journalled in the frame and having intertting driveconnect-ion with the first shaft in the plate, an angular bracket armprojecting from one side of the frame and secured thereto upon oppositesides of the shaft thereof, said frame having a slot and a communicatingbearing for the outer end of said shaft, a beveled gear fixed to theshaft in the slot, a stud bearing extending laterally from the end ofthe frame beneath the bracket arm and having an extension secured to thebracket arm; a beveled gear journalled against endvvise movement on thebearing and in mesh ivithithe first gear, and a circular cutter memberfixed to the second gear in a plane substantially parallel to the Varmand second `gear and positioned between the same, the peripheral cuttersof said member projecting beneath the second gear.

(l. ln an attachment for milling machines or the like having a driveshaft, a. frame carried by the machine having a transverse slot formedtherein, a driven shaft journalled in the frame and having operative riband slot connection with the drive shaft. said frame having a studbearing formed therewith and extending laterally beloiv the frame andtransverse slot, a beveled gear fixed to the shaft, a second beveledgear journalled on the stud bearing in mesh With the first gear, acutter head fixed to and in contact with the second gear to rotatetherewith on the stud bearing and havingl peripheral cutters projectingoutwardly of the periphery of the second gear.

EDWARD J. JANAC.

